Persson's Theorem is a result in the field of mathematics, specifically in the study of complex analysis and potential theory. It provides conditions under which a certain type of function, known as a harmonic function, can be represented in terms of its boundary values. This theorem is particularly useful in solving problems related to the behavior of functions in various domains. The theorem is named after Bertil Persson, who contributed to the understanding of harmonic functions and their applications. By establishing a connection between boundary values and interior properties, Persson's Theorem aids in the analysis of physical phenomena modeled by these functions, such as heat distribution and fluid flow.